Projects/Webserver/Lib/TELNETServerApp.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  TELNET Webserver Application. When connected to the uIP stack,
  34  *  this will serve out connection information to the client.
  35  */
  36
  37 #define  INCLUDE_FROM_TELNETSERVERAPP_C
  38 #include "TELNETServerApp.h"
  39
  40 /** Welcome message to send to a TELNET client when a connection is first made. */
  41 char PROGMEM WelcomeHeader[] = "********************************************\r\n"
  42                                "*       LUFA uIP Webserver (TELNET)        *\r\n"
  43                                "********************************************\r\n";
  44
  45 /** Main TELNET menu, giving the user the list of available commands they may issue */
  46 char PROGMEM TELNETMenu[] = "\r\n"
  47                             "   Available Commands:\r\n"
  48                             "     c) List Active TCP Connections\r\n"
  49                                                 "\r\nCommand>";
  50
  51 /** Initialization function for the simple HTTP webserver. */
  52 void TELNETServerApp_Init(void)
  53 {
  54         /* Listen on port 23 for TELNET connections from hosts */
  55         uip_listen(HTONS(TELNET_SERVER_PORT));
  56 }
  57
  58 /** uIP stack application callback for the TELNET server. This function must be called each time the
  59  *  TCP/IP stack needs a TCP packet to be processed.
  60  */
  61 void TELNETServerApp_Callback(void)
  62 {
  63         uip_tcp_appstate_t* const AppState   = &uip_conn->appstate;
  64         char*               const AppData    = (char*)uip_appdata;
  65
  66         if (uip_connected())
  67         {
  68                 AppState->TELNETServer.CurrentState = TELNET_STATE_SendHeader;
  69         }
  70
  71         if (uip_acked())
  72         {
  73                 AppState->TELNETServer.CurrentState = AppState->TELNETServer.NextState;
  74         }
  75
  76         if (uip_rexmit() || uip_acked() || uip_newdata() || uip_connected() || uip_poll())
  77         {
  78                 switch (AppState->TELNETServer.CurrentState)
  79                 {
  80                         case TELNET_STATE_SendHeader:
  81                                 /* Copy over and send the TELNET welcome message upon first connection */
  82                                 strcpy_P(AppData, WelcomeHeader);
  83                                 uip_send(AppData, strlen(AppData));
  84
  85                                 AppState->TELNETServer.NextState = TELNET_STATE_SendMenu;
  86                                 break;
  87                         case TELNET_STATE_SendMenu:
  88                                 /* Copy over and send the TELNET menu to the client */
  89                                 strcpy_P(AppData, TELNETMenu);
  90                                 uip_send(AppData, strlen(AppData));
  91
  92                                 AppState->TELNETServer.NextState = TELNET_STATE_GetCommand;
  93                                 break;
  94                         case TELNET_STATE_GetCommand:
  95                                 if (!(uip_datalen()))
  96                                   break;
  97
  98                                 /* Save the issued command for later processing */
  99                                 AppState->TELNETServer.IssuedCommand = AppData[0];
 100
 101                                 AppState->TELNETServer.CurrentState  = TELNET_STATE_SendResponse;
 102                                 break;
 103                         case TELNET_STATE_SendResponse:
 104                                 /* Determine which command was issued, perform command processing */
 105                                 switch (AppState->TELNETServer.IssuedCommand)
 106                                 {
 107                                         case 'c':
 108                                                 TELNETServerApp_DisplayTCPConnections();
 109                                                 break;
 110                                         default:
 111                                                 strcpy(AppData, "Invalid Command.\r\n");
 112                                                 uip_send(AppData, strlen(AppData));
 113                                                 break;
 114                                 }
 115
 116                                 AppState->TELNETServer.NextState = TELNET_STATE_SendMenu;
 117                                 break;
 118                 }
 119         }
 120 }
 121
 122 /** Sends a list of active TCP connections to the TELNET client. */
 123 static void TELNETServerApp_DisplayTCPConnections(void)
 124 {
 125         char* const AppData    = (char*)uip_appdata;
 126
 127         strcpy(AppData, "\r\n* Current TCP Connections: *\r\n");
 128
 129         uint16_t ResponseLen     = strlen(AppData);
 130         uint8_t  ActiveConnCount = 0;
 131
 132         /* Loop through the complete uIP TCP connections list, looking for active connections */
 133         for (uint8_t i = 0; i < UIP_CONNS; i++)
 134         {
 135                 struct uip_conn* CurrConnection = &uip_conns[i];
 136
 137                 /* If the connection is not closed, it is active and must be added to the out buffer */
 138                 if (CurrConnection->tcpstateflags != UIP_CLOSED)
 139                 {
 140                         /* Add the current connection's details to the out buffer */
 141                         ResponseLen += sprintf(&AppData[ResponseLen], "%u) %02d.%02d.%02d.%02d (Local %u, Remote %u)\r\n",
 142                                                                    ++ActiveConnCount, CurrConnection->ripaddr.u8[0],
 143                                                                                                           CurrConnection->ripaddr.u8[1],
 144                                                                                                           CurrConnection->ripaddr.u8[2],
 145                                                                                                           CurrConnection->ripaddr.u8[3],
 146                                                                    HTONS(CurrConnection->lport), HTONS(CurrConnection->rport));
 147                 }
 148         }
 149
 150         uip_send(AppData, ResponseLen);
 151 }